1-3.Retrofit 异常请求清单（404 请求、超时请求、连接失败请求）

标签：请求 ------------------------------ create 404 okHttpClientBuilder new Retrofit

Retrofit

1、Retrofit 概述

Retrofit 是一个网络请求库，专门用于发送 HTTP 请求和处理 HTTP 响应

2、Retrofit 引入

在 AndroidManifest.xml 文件中添加相关权限，如果是 Android 6.0（API 级别 23）或之后，需要在运行时请求

<uses-permission android:name="android.permission.INTERNET" />

在模块级 build.gradle 中引入相关依赖

implementation 'com.squareup.okhttp3:logging-interceptor:3.8.1'

implementation 'com.squareup.retrofit2:retrofit:2.9.0'
implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
implementation 'com.squareup.retrofit2:converter-scalars:2.9.0'

implementation 'com.squareup.retrofit2:adapter-rxjava:2.1.0'
implementation 'io.reactivex:rxandroid:1.2.0'

3、Retrofit 使用步骤

创建接口：创建一个接口，并定义具体的请求方法，使用 Retrofit 提供的注解来描述 HTTP 请求
配置 Retrofit：使用 Retrofit.Builder 构建出一个 Retrofit 实例对象
创建接口代理对象：通过 Retrofit 实例对象创建接口的代理对象
发送并处理请求：调用接口方法发送网络请求，通过回调处理请求结果

一、404 请求

1、Client Api

ApiService.java

@GET("test/testGet12345")
Call<String> test404();

2、Client Test

MainActivity.java

// 日志拦截器
HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();
httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

OkHttpClient.Builder okHttpClientBuilder = new OkHttpClient.Builder();
okHttpClientBuilder.addInterceptor(httpLoggingInterceptor);
OkHttpClient okHttpClient = okHttpClientBuilder.build();

// 构建 Retrofit 对象
Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("http://172.31.8.3:9999")
        .client(okHttpClient)
        .addConverterFactory(ScalarsConverterFactory.create())
        .addConverterFactory(GsonConverterFactory.create()) // 解析实体类
        .addCallAdapterFactory(RxJavaCallAdapterFactory.create()) // 结合 RxJava
        .build();

ApiService apiService = retrofit.create(ApiService.class);

apiService.test404().enqueue(new Callback<String>() {
    @Override
    public void onResponse(Call<String> call, Response<String> response) {
        if (response.code() == 200) {
            String result = response.body();

            Log.i(TAG, "------------------------------ 请求成功，结果为：" + result);

            return;
        }

        if (response.code() == 404) {
            Log.i(TAG, "------------------------------ 请求 404");
            return;
        }

        Log.i(TAG, "------------------------------ 请求失败");
    }

    @Override
    public void onFailure(Call<String> call, Throwable t) {
        Log.i(TAG, "------------------------------ 请求失败：" + t.getMessage());
        Log.i(TAG, "------------------------------ " + t.getClass().getName());
    }
});

输出结果

D/OkHttp: --> GET http://192.168.0.10:9999/test/testGet12345 http/1.1
D/OkHttp: --> END GET

D/OkHttp: <-- 404  http://192.168.0.10:9999/test/testGet12345 (101ms)
D/OkHttp: Content-Type: application/json
D/OkHttp: Transfer-Encoding: chunked
D/OkHttp: Date: Wed, 16 Oct 2024 13:01:13 GMT
D/OkHttp: Keep-Alive: timeout=60
D/OkHttp: Connection: keep-alive
D/OkHttp: {"timestamp":"2024-10-16T13:01:13.422+00:00","status":404,"error":"Not Found","path":"/test/testGet12345"}
D/OkHttp: <-- END HTTP (106-byte body)

I/MainActivity: ------------------------------ 请求 404

二、超时请求

1、Server

TestController.java

@RestController
@RequestMapping("/test")
@CrossOrigin
public class TestController {

    @GetMapping("/testTimeout")
    public String testTimeout() {
        try {
            Thread.sleep(20 * 1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "testTimeout Hello World";
    }
}

2、Client Api

ApiService.java

@GET("/test/testTimeout")
Call<String> testTimeout();

3、Client Test

MainActivity.java

// 日志拦截器
HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();
httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

OkHttpClient.Builder okHttpClientBuilder = new OkHttpClient.Builder();
okHttpClientBuilder.addInterceptor(httpLoggingInterceptor);
okHttpClientBuilder.connectTimeout(10, TimeUnit.SECONDS); // 连接超时
okHttpClientBuilder.readTimeout(10, TimeUnit.SECONDS); // 读取超时
okHttpClientBuilder.writeTimeout(10, TimeUnit.SECONDS); // 写入超时
OkHttpClient okHttpClient = okHttpClientBuilder.build();

// 构建 Retrofit 对象
Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("http://172.31.8.3:9999")
        .client(okHttpClient)
        .addConverterFactory(ScalarsConverterFactory.create())
        .addConverterFactory(GsonConverterFactory.create()) // 解析实体类
        .addCallAdapterFactory(RxJavaCallAdapterFactory.create()) // 结合 RxJava
        .build();

apiService = retrofit.create(ApiService.class);

apiService.testTimeout().enqueue(new Callback<String>() {
    @Override
    public void onResponse(Call<String> call, Response<String> response) {
        String result = response.body();

        Log.i(TAG, "------------------------------ 请求成功，结果为：" + result);
    }

    @Override
    public void onFailure(Call<String> call, Throwable t) {
        Log.i(TAG, "------------------------------ 请求失败：" + t.getMessage());
        Log.i(TAG, "------------------------------ " + t.getClass().getName());
    }
});

输出结果

D/OkHttp: --> GET http://192.168.0.10:9999/test/testTimeout http/1.1
D/OkHttp: --> END GET

D/OkHttp: <-- HTTP FAILED: java.net.SocketTimeoutException: timeout

I/Main2Activity: ------------------------------ 请求失败：timeout
I/Main2Activity: ------------------------------ java.net.SocketTimeoutException

三、连接失败请求（错误地址）

1、Client Api

ApiService.java

@GET("/test/testGet")
Call<String> testFailedToConnect();

2、Client Test

MainActivity.java

// 日志拦截器
HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();
httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

OkHttpClient.Builder okHttpClientBuilder = new OkHttpClient.Builder();
okHttpClientBuilder.addInterceptor(httpLoggingInterceptor);
OkHttpClient okHttpClient = okHttpClientBuilder.build();

// 构建 Retrofit 对象
Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("http://192.168.0.11:9999")
        .client(okHttpClient)
        .addConverterFactory(ScalarsConverterFactory.create())
        .addConverterFactory(GsonConverterFactory.create()) // 解析实体类
        .addCallAdapterFactory(RxJavaCallAdapterFactory.create()) // 结合 RxJava
        .build();

ApiService apiService = retrofit.create(ApiService.class);

apiService.testFailedToConnect().enqueue(new Callback<String>() {
    @Override
    public void onResponse(Call<String> call, Response<String> response) {
        String result = response.body();

        Log.i(TAG, "------------------------------ 请求成功，结果为：" + result);
    }

    @Override
    public void onFailure(Call<String> call, Throwable t) {
        Log.i(TAG, "------------------------------ 请求失败：" + t.getMessage());
        Log.i(TAG, "------------------------------ " + t.getClass().getName());
    }
});

输出结果

D/OkHttp: --> GET http://192.168.0.11:9999/test/testGet http/1.1
D/OkHttp: --> END GET

标签：请求,------------------------------,create,404,okHttpClientBuilder,new,Retrofit
From： https://blog.csdn.net/weixin_52173250/article/details/142992074

1-3.Retrofit 异常请求清单（404 请求、超时请求、连接失败请求）

Retrofit

1、Retrofit 概述

2、Retrofit 引入

3、Retrofit 使用步骤

一、404 请求

1、Client Api

2、Client Test

二、超时请求

1、Server

2、Client Api

3、Client Test

三、连接失败请求（错误地址）

1、Client Api

2、Client Test

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